Influence of nanoscale TiO2 film thickness on gas sensing properties of capacitor-like Pt/TiO2/Pt sensing structure

Li, Zhong; Haidry, Azhar Ali; Pleceník, T.; Vidiš, Marek; Grančič, Branislav; Роч, Т.; Gregor, M.; Ďurina, Pavol; Yao, Zhengjun; Plecenı́k, A.

doi:10.1016/j.apsusc.2019.143909

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…This process increases the heterojunction barrier and results in an obvious nonlinear relationship in the I−V curve. 35 The photo-response curves of sensors based on In 2 O 3 , TiO 2 , and In 2 O 3 /TiO 2 nanocomposites to UV light at RT are shown in Figure 4b. It is worth noting that the baseline resistance of the In 2 O 3 /TiO 2 nanocomposites-based sensor is only several million ohms, which is much lower than the resistance of pure TiO 2 (∼hundreds of megaohms).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

Zhang

Sun

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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Hollow In 2 O 3 @TiO 2 double-layer nanospheres were prepared via a facile water bath method using the sacrifice template of carbon nanospheres. It is shown that the size of the In 2 O 3 /TiO 2 nanocomposites is 150−250 nm, the thickness of the In 2 O 3 shell is about 10 nm, and the thickness of the TiO 2 shell is about 15 nm. The sensing performances of the synthesized In 2 O 3 /TiO 2 nanocomposites-based chemiresistive-type sensor to formaldehyde (HCHO) gas under UV light activation at room temperature have been studied. Compared to the pure In 2 O 3 -and pure TiO 2based sensors, the In 2 O 3 /TiO 2 nanocomposite sensor exhibits much better sensing performances to formaldehyde. The response of the In 2 O 3 /TiO 2 nanocomposite-based sensor to 1 ppm formaldehyde is about 3.8, and the response time and recovery time are 28 and 50 s, respectively. The detectable formaldehyde concentration can reach as low as 0.06 ppm. The role of the formed In 2 O 3 /TiO 2 heterojunctions and the involved chemical reactions activated by UV light have been investigated by AC impedance spectroscopy and the in situ diffuse reflectance Fourier transform infrared spectroscopy. The improvement of the sensing properties of In 2 O 3 / TiO 2 nanocomposites could be attributed to the nanoheterojunctions between the two components and the "combined photocatalytic effects" of UV-light-emitting diode irradiation. Density functional theory calculations demonstrated that introducing heterojunctions could improve the adsorption energy and charge transfer between formaldehyde and sensing materials.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…Since the work functions of In 2 O 3 and TiO 2 are different, the generated electrons will transfer to the In 2 O 3 side to form an electron depletion layer. This process increases the heterojunction barrier and results in an obvious nonlinear relationship in the I – V curve …”

Section: Resultsmentioning

confidence: 99%

UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

Zhang

Sun

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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“…A successful approach proved to be doping with non-metals, [5][6][7] doping with metals such as Pt, 8 or interfacing metals by deposition at the surface. [9][10][11][12] The Pt ion at the TiO 2 surface acts as a chargegeneration center, producing free and trapped charges. 13,14 Density functional theory (DFT)+U study revealed that N-doping promotes dissociative water adsorption, leading to favorable adsorbate-substrate interactions and stabilization of OH groups at the TiO 2 surface.…”

Section: Introductionmentioning

confidence: 99%

Origin of photocatalytic activity enhancement in Pd/Pt-deposited anatase N-TiO₂ – experimental insights and DFT study of the (001) surface

Batalović

Radaković

Bundaleski

et al. 2020

Phys. Chem. Chem. Phys.

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“…Under UV activation, the I-V polarization curves of the two sensors showed a slight nonlinear relationship between the applied voltage and the measured current. Due to the presence of nanoheterojunctions in the samples, photogenerated electrons were generated and transferred under UV excitation [53]. This process increases the energy barrier at the nanoheterojunctions, which illustrates that UV activation enhances the nanoheterojunction properties.…”

Section: Electrical Characterization and Gas-sensing Propertymentioning

confidence: 96%

UV-Activated Au Modified TiO2/In2O3 Hollow Nanospheres for Formaldehyde Detection at Room Temperature

et al. 2023

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Au modified TiO2/In2O3 hollow nanospheres were synthesized by the hydrolysis method using the carbon nanospheres as a sacrificial template. Compared to pure In2O3, pure TiO2, and TiO2/In2O3 based sensors, the Au/TiO2/In2O3 nanosphere-based chemiresistive-type sensor exhibited excellent sensing performances to formaldehyde at room temperature under ultraviolet light (UV-LED) activation. The response of the Au/TiO2/In2O3 nanocomposite-based sensor to 1 ppm formaldehyde was about 5.6, which is higher than that of In2O3 (1.6), TiO2 (2.1), and TiO2/In2O3 (3.8). The response time and recovery time of the Au/TiO2/In2O3 nanocomposite sensor were 18 s and 42 s, respectively. The detectable formaldehyde concentration could go down as low as 60 ppb. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) was used to analyze the chemical reactions on the surface of the sensor activated by UV light. The improvement in the sensing properties of the Au/TiO2/In2O3 nanocomposites could be attributed to the nanoheterojunctions and electronic/chemical sensitization of the Au nanoparticles.

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Influence of nanoscale TiO2 film thickness on gas sensing properties of capacitor-like Pt/TiO2/Pt sensing structure

Cited by 12 publications

References 30 publications

UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

Origin of photocatalytic activity enhancement in Pd/Pt-deposited anatase N-TiO₂ – experimental insights and DFT study of the (001) surface

UV-Activated Au Modified TiO2/In2O3 Hollow Nanospheres for Formaldehyde Detection at Room Temperature

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Influence of nanoscale TiO2 film thickness on gas sensing properties of capacitor-like Pt/TiO2/Pt sensing structure

Cited by 12 publications

References 30 publications

UV-Enhanced Formaldehyde Sensor Using Hollow In2O3@TiO2 Double-Layer Nanospheres at Room Temperature

UV-Enhanced Formaldehyde Sensor Using Hollow In2O3@TiO2 Double-Layer Nanospheres at Room Temperature

Origin of photocatalytic activity enhancement in Pd/Pt-deposited anatase N-TiO2 – experimental insights and DFT study of the (001) surface

UV-Activated Au Modified TiO2/In2O3 Hollow Nanospheres for Formaldehyde Detection at Room Temperature

Contact Info

Product

Resources

About

UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

UV-Enhanced Formaldehyde Sensor Using Hollow In₂O₃@TiO₂ Double-Layer Nanospheres at Room Temperature

Origin of photocatalytic activity enhancement in Pd/Pt-deposited anatase N-TiO₂ – experimental insights and DFT study of the (001) surface